<!--
 * @Author: 黄龙 
 * @pageName: 'tree-grid  树型表格' 
 * @Date: 2017-07-17 16:48:44 
 * @Last Modified by:   黄龙 
 * @Last Modified time: 2017-07-17 16:48:44 
 * @events  @on-row-click 单击行或者单击操作按钮方法
            @on-selection-change  多选模式下 选中项变化时触发
            @on-sort-change  排序时有效，当点击排序时触发
   @props   items 显示的结构化数据
            columns 表格列的配置描述 sortable:true 开启排序功能 
            type: 'selection'为多选功能 type: 'action' 为操作功能 actions:[{}] 操作按钮
 -->
<template>
    <div :style="{width:tableWidth}" class='autoTbale'>
        <table class="table table-bordered" id='hl-tree-table'>
            <thead>
                <tr>
                    <th v-for="(column,index) in cloneColumns">
                        <label v-if="column.type === 'selection'">
                            <input type="checkbox" v-model="checks" @click="handleCheckAll">
                        </label>
                        <label v-else>
                            {{ renderHeader(column, index) }}
                            <span class="ivu-table-sort" v-if="column.sortable">
                                <Icon type="arrow-up-b" :class="{on: column._sortType === 'asc'}" @click.native="handleSort(index, 'asc')" />
                                <Icon type="arrow-down-b" :class="{on: column._sortType === 'desc'}" @click.native="handleSort(index, 'desc')" />
                            </span>
                        </label>
                    </th>
                </tr>
            </thead>
            <tbody>
                <tr v-for="(item,index) in initItems" :key="item.id" v-show="show(item)" :class="{'child-tr':item.parent}">
                    <td v-for="(column,snum) in columns" :key="column.key" :style=tdStyle(column)>
                        <label v-if="column.type === 'selection'">
                            <input type="checkbox" :value="item.id" v-model="checkGroup" @click="handleCheckClick(item,$event,index)">
                        </label>
                        <div v-if="column.type === 'action'">
                            <i-button :type="action.type" size="small" @click="RowClick(item,$event,index,action.text)" v-for='action in (column.actions)' :key="action.text">{{action.text}}</i-button>
                        </div>
                        <label @click="toggle(index,item)" v-if="!column.type">
                            <span v-if='snum==iconRow()'>
                                <i v-html='item.spaceHtml'></i>
                                <i v-if="item.children&&item.children.length>0" class="ivu-icon" :class="{'ivu-icon-plus-circled':!item.expanded,'ivu-icon-minus-circled':item.expanded }"></i>
                                <i v-else class="ms-tree-space"></i>
                            </span> {{renderBody(item,column) }}
                        </label>
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
</template>
<script>
export default {
    name: 'treeGrid',
    props: {
        columns: Array,
        items: {
            type: Array,
            default: function () {
                return [];
            }
        }
    },
    data () {
        return {
            initItems: [], // 处理后数据数组
            cloneColumns: [], // 处理后的表头数据
            checkGroup: [], // 复选框数组
            checks: false, // 全选
            screenWidth: document.body.clientWidth, // 自适应宽
            tdsWidth: 0, // td总宽
            timer: false, // 控制监听时长
            dataLength: 0 // 树形数据长度
        };
    },
    computed: {
        tableWidth () {
            return this.tdsWidth > this.screenWidth && this.screenWidth > 0 ? this.screenWidth + 'px' : '100%';
        }
    },
    watch: {
        screenWidth (val) {
            if (!this.timer) {
                this.screenWidth = val;
                this.timer = true;
                setTimeout(() => {
                    this.timer = false;
                }, 400);
            }
        },
        items () {
            if (this.items) {
                this.dataLength = this.Length(this.items);
                this.initData(this.deepCopy(this.items), 1, null);
                this.checkGroup = this.renderCheck(this.items);
                if (this.checkGroup.length == this.dataLength) {
                    this.checks = true;
                } else {
                    this.checks = false;
                }
            }
        },
        columns: {
            handler () {
                this.cloneColumns = this.makeColumns();
            },
            deep: true
        },
        checkGroup (data) {
            this.checkAllGroupChange(data);
        }
    },
    mounted () {
        if (this.items) {
            this.dataLength = this.Length(this.items);
            this.initData(this.deepCopy(this.items), 1, null);
            this.cloneColumns = this.makeColumns();
            this.checkGroup = this.renderCheck(this.items);
            if (this.checkGroup.length == this.dataLength) {
                this.checks = true;
            } else {
                this.checks = false;
            }
        }
        // 绑定onresize事件 监听屏幕变化设置宽
        this.$nextTick(() => {
            this.screenWidth = document.body.clientWidth;
        });
        window.onresize = () => {
            return (() => {
                window.screenWidth = document.body.clientWidth;
                this.screenWidth = window.screenWidth;
            })();
        };
    },
    methods: {
        // 有无多选框折叠位置优化
        iconRow () {
            for (var i = 0, len = this.columns.length; i < len; i++) {
                if (this.columns[i].type == 'selection') {
                    return 1;
                }
            }
            return 0;
        },
        // 设置td宽度,td的align
        tdStyle (column) {
            var style = {};
            if (column.align) {
                style['text-align'] = column.align;
            }
            if (column.width) {
                style['min-width'] = column.width + 'px';
            }
            return style;
        },

        // 排序事件
        handleSort (index, type) {
            this.cloneColumns.forEach((col) => col._sortType = 'normal');
            if (this.cloneColumns[index]._sortType === type) {
                this.cloneColumns[index]._sortType = 'normal';
            } else {
                this.cloneColumns[index]._sortType = type;
            }
            this.$emit('on-sort-change', this.cloneColumns[index]['key'], this.cloneColumns[index]['_sortType']);
        },
        // 点击某一行事件
        RowClick (data, event, index, text) {
            let result = this.makeData(data);
            this.$emit('on-row-click', result, event, index, text);
        },
        // 点击事件 返回数据处理
        makeData (data) {
            const t = this.type(data);
            let o;
            if (t === 'array') {
                o = [];
            } else if (t === 'object') {
                o = {};
            } else {
                return data;
            }

            if (t === 'array') {
                for (let i = 0; i < data.length; i++) {
                    o.push(this.makeData(data[i]));
                }
            } else if (t === 'object') {
                for (let i in data) {
                    if (i != 'spaceHtml' && i != 'parent' && i != 'level' && i != 'expanded' && i != 'isShow' && i !=
                        'load') {
                        o[i] = this.makeData(data[i]);
                    }
                }
            }
            return o;
        },
        // 处理表头数据
        makeColumns () {
            let columns = this.deepCopy(this.columns);
            this.tdsWidth = 0;
            columns.forEach((column, index) => {
                column._index = index;
                column._width = column.width ? column.width : '';
                column._sortType = 'normal';
                this.tdsWidth += column.width ? parseFloat(column.width) : 0;
            });
            return columns;
        },
        // 数据处理 增加自定义属性监听
        initData (items, level, parent) {
            this.initItems = [];
            let spaceHtml = '';
            for (var i = 1; i < level; i++) {
                spaceHtml += '<i class=\'ms-tree-space\'></i>';
            }
            items.forEach((item, index) => {
                item = Object.assign({}, item, {
                    'parent': parent,
                    'level': level,
                    'spaceHtml': spaceHtml
                });
                if ((typeof item.expanded) === 'undefined') {
                    item = Object.assign({}, item, {
                        'expanded': false
                    });
                }
                if ((typeof item.show) === 'undefined') {
                    item = Object.assign({}, item, {
                        'isShow': false
                    });
                }
                if ((typeof item.isChecked) === 'undefined') {
                    item = Object.assign({}, item, {
                        'isChecked': false
                    });
                }
                item = Object.assign({}, item, {
                    'load': (!!item.expanded)
                });
                this.initItems.push(item);
                if (item.children && item.expanded) {
                    this.initData(item.children, level + 1, item);
                }
            });
        },
        //  隐藏显示
        show (item) {
            return ((item.level == 1) || (item.parent && item.parent.expanded && item.isShow));
        },
        toggle (index, item) {
            let level = item.level + 1;
            let spaceHtml = '';
            for (var i = 1; i < level; i++) {
                spaceHtml += '<i class=\'ms-tree-space\'></i>';
            }
            if (item.children) {
                if (item.expanded) {
                    item.expanded = !item.expanded;
                    this.close(index, item);
                } else {
                    item.expanded = !item.expanded;
                    if (item.load) {
                        this.open(index, item);
                    } else {
                        item.load = true;
                        item.children.forEach((child, childIndex) => {
                            this.initItems.splice((index + childIndex + 1), 0, child);
                            // 设置监听属性
                            this.$set(this.initItems[index + childIndex + 1], 'parent', item);
                            this.$set(this.initItems[index + childIndex + 1], 'level', level);
                            this.$set(this.initItems[index + childIndex + 1], 'spaceHtml', spaceHtml);
                            this.$set(this.initItems[index + childIndex + 1], 'isShow', true);
                            this.$set(this.initItems[index + childIndex + 1], 'expanded', false);
                        });
                    }
                }
            }
        },
        open (index, item) {
            if (item.children) {
                item.children.forEach((child, childIndex) => {
                    child.isShow = true;
                    if (child.children && child.expanded) {
                        this.open(index + childIndex + 1, child);
                    }
                });
            }
        },
        close (index, item) {
            if (item.children) {
                item.children.forEach((child, childIndex) => {
                    child.isShow = false;
                    child.expanded = false;
                    if (child.children) {
                        this.close(index + childIndex + 1, child);
                    }
                });
            }
        },
        // 点击check勾选框,判断是否有children节点 如果有就一并勾选
        handleCheckClick (data, event, index) {
            data.isChecked = !data.isChecked;
            var arr = data.children;
            if (arr) {
                if (data.isChecked) {
                    this.checkGroup.push(data.id);
                    for (let i = 0; i < arr.length; i++) {
                        this.checkGroup.push(arr[i].id);
                    }
                } else {
                    for (var i = 0; i < this.checkGroup.length; i++) {
                        if (this.checkGroup[i] == data.id) {
                            this.checkGroup.splice(i, 1);
                        }
                        for (var j = 0; j < arr.length; j++) {
                            if (this.checkGroup[i] == arr[j].id) {
                                this.checkGroup.splice(i, 1);
                            }
                        }
                    }
                }
            }
        },
        // checkbox 全选 选择事件
        handleCheckAll () {
            this.checks = !this.checks;
            if (this.checks) {
                this.checkGroup = this.getArray(this.checkGroup.concat(this.All(this.items)));
            } else {
                this.checkGroup = [];
            }
            // this.$emit('on-selection-change', this.checkGroup)
        },
        // 数组去重
        getArray (a) {
            var hash = {},
                len = a.length,
                result = [];
            for (var i = 0; i < len; i++) {
                if (!hash[a[i]]) {
                    hash[a[i]] = true;
                    result.push(a[i]);
                }
            }
            return result;
        },
        checkAllGroupChange (data) {
            if (this.dataLength > 0 && data.length === this.dataLength) {
                this.checks = true;
            } else {
                this.checks = false;
            }
            this.$emit('on-selection-change', this.checkGroup);
        },
        All (data) {
            let arr = [];
            data.forEach((item) => {
                arr.push(item.id);
                if (item.children && item.children.length > 0) {
                    arr = arr.concat(this.All(item.children));
                }
            });
            return arr;
        },
        // 返回树形数据长度
        Length (data) {
            let length = data.length;
            data.forEach((child) => {
                if (child.children) {
                    length += this.Length(child.children);
                }
            });
            return length;
        },
        // 返回表头
        renderHeader (column, $index) {
            if ('renderHeader' in this.columns[$index]) {
                return this.columns[$index].renderHeader(column, $index);
            } else {
                return column.title || '#';
            }
        },

        // 返回内容
        renderBody (row, column, index) {
            return row[column.key];
        },
        // 默认选中
        renderCheck (data) {
            let arr = [];
            data.forEach((item) => {
                if (item._checked) {
                    arr.push(item.id);
                }
                if (item.children && item.children.length > 0) {
                    arr = arr.concat(this.renderCheck(item.children));
                }
            });
            return arr;
        },
        // 深度拷贝函数
        deepCopy (data) {
            var t = this.type(data),
                o, i, ni;
            if (t === 'array') {
                o = [];
            } else if (t === 'object') {
                o = {};
            } else {
                return data;
            }
            if (t === 'array') {
                for (i = 0, ni = data.length; i < ni; i++) {
                    o.push(this.deepCopy(data[i]));
                }
                return o;
            } else if (t === 'object') {
                for (i in data) {
                    o[i] = this.deepCopy(data[i]);
                }
                return o;
            }
        },
        type (obj) {
            var toString = Object.prototype.toString;
            var map = {
                '[object Boolean]': 'boolean',
                '[object Number]': 'number',
                '[object String]': 'string',
                '[object Function]': 'function',
                '[object Array]': 'array',
                '[object Date]': 'date',
                '[object RegExp]': 'regExp',
                '[object Undefined]': 'undefined',
                '[object Null]': 'null',
                '[object Object]': 'object'
            };
            return map[toString.call(obj)];
        }
    },
    beforeDestroy () {
        window.onresize = null;
    }
};
</script>
<style>
.autoTbale {
    overflow: auto;
}

table {
    width: 100%;
    border-spacing: 0;
    border-collapse: collapse;
}

.table-bordered {
    border: 1px solid #EBEBEB;
}

.table>tbody>tr>td,
.table>tbody>tr>th,
.table>thead>tr>td,
.table>thead>tr>th {
    border-top: 1px solid #e7eaec;
    line-height: 1.42857;
    padding: 8px;
    vertical-align: middle;
}

.table-bordered>tbody>tr>td,
.table-bordered>tbody>tr>th,
.table-bordered>tfoot>tr>td,
.table-bordered>tfoot>tr>th,
.table-bordered>thead>tr>td,
.table-bordered>thead>tr>th {
    border: 1px solid #e7e7e7;
}

.table>thead>tr>th {
    border-bottom: 1px solid #DDD;
}

.table-bordered>thead>tr>td,
.table-bordered>thead>tr>th {
    background-color: #F5F5F6;
}

#hl-tree-table>tbody>tr {
    background-color: #fbfbfb;
}

#hl-tree-table>tbody>.child-tr {
    background-color: #fff;
}

label {
    margin: 0 8px;
}

.ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: 14px;
    height: 14px;
}

.ms-tree-space::before {
    content: ""
}

#hl-tree-table th>label {
    margin: 0;
}
</style>
